TweeGo is a new Twitter application for N900. What makes it interesting that it’s not a mere dumb frontend to the twitter protocol, but a nice showcase application for Qt Graphics View and Qt Animation Framework. If you’ve been wondering what you could do with graphics view (and how you should go about it), the codebase of TweeGo, available on gitorious, is a good place to get started!
While the app is intended for N900, there doesn’t seem to be anything N900-specific about it. I was able to compile it for desktop Ubuntu just fine, though it does need Qt 4.6 or newer (the default Qt on karmic won’t cut it).
Note that this kind of application is exactly where QML will shine, once it’s widely deployed.